fix(LoginTemplate): add support for Custom User Model

It allows the `username` label to be displayed dynamically for custom user model.
Merge pull request #200 from theskumar/patch-1

fix(LoginTemplate): add support for Custom User Model - show correct username field label
Show admin link only when request and request.user variables are
available. Otherwise django test "test_middleware_disabled" fails.
Fixes #90
Fixed exception when menu config is Unicode

If the menu config is Unicode (e.g. `from __future__ import unicode_literals` or `u'string'`), the Suit menu will trigger an exception. Tested on Python 2.7 with Django 1.6.
Restored Django < 1.4.2 compatibility
Merge pull request #206 from kane-c/develop

Fixed exception when menu config is Unicode
Fixes #209 Wrap jQuery autosize in Suit jQuery scope
Feature: Sortable for Stacked and Generic inlines added. #137
Version bump to 0.2.7
Merge branch 'develop'